100l of a solution of salt and water contains 100.1%=1(l) of salt and 100-1=99(l) of water.
Because the volume of salt remains constant, the volume of the latter solution is: 1/5%=20(l); so there is 20-1=19(l) of water.
In conclusion, 99-19=80(l) of water evaporated (OMG HOW LONG DID YOU BOIL THAT SOLUTION? THAT'S EIGHTLY LITERS OF EVAPORATION!!! HOW UNREALISTICALLY HILARIOUS)

Duncan's starting number:
a=25+6.14=109
Taz's starting number:
b=25-8.14=-87
The sum:
a+b=22

s=1.04mi
v₁=2.4mi/h
v₂=2.8mi/h
t₁=8.00am
---
t₂=?
The time it will take until Ellie and Emma meet eachother:
   \(\Delta\)t=\(\dfrac{s}{v_1+v_2}\)=0.2(h)=12'
Ellie and Emma will meet at:
   t₂=t₁+\(\Delta\)t=8:12 a.m.

For each face, we have S₁=3²-1²=8(square units)
However, if we count the hole created by the lost cube, we also have S₂=5.1²=5(square units)
So the surface area of each face is S_d=S₁+S₂=13(square units)
A cube has 6 faces, so the total surface area of the cube is S_tp=6S_d=78(square units)

5!=120
120/5=24
3+4+5+6+7=25
25*24=600
600*11111=6666600

Sorry, accidentally type deivisible, it's *divisable

447 is not prime because it's divisible by 3
449 is prime but it's not deletable
451 is not prime because it's deivisible by 11
453 is not prime because it's divisible by 3
457 is prime. If you remove the digit "5", you'll get 47, which is prime, then you can remove "4" to get the prime number 7. So the anser is 457